Fearing that someone is stalking them after a series of dangerous accidents, the Baby-sitters escape for a skiing weekend but become petrified when the trouble follows them and points to someone from their past.

The hit series is back, to charm and inspire another generation of baby-sitters! When Dawn starts getting threatening notes and odd phone calls while she's baby-sitting, she doesn't know what to do. The notes are signed "Mr. X," and they're beginning to get scary. Normally, she'd tell the rest of the BSC, but this time things are different.The kids at Stoneybrook Elementary are having a Sitter of the Month Contest. The Sitter of the Month has to be someone who is in control--someone whose jobs always go smoothly. Dawn doesn't want to blow her chances at winning. But what if she's in real danger?The best friends you'll ever have are detectives, too!

Back in California for the surfing competition, Dawn must soon solve a mystery involving a missing surfer, a mangled surfboard, and a ghost who surfs at night.

The hit series is back, to charm and inspire another generation of baby-sitters! Naturally, Jessi is thrilled when she earns the lead role her in dance school's latest ballet. But someone in class wants her out of the show. First Jessi's toe shoes are stolen. Then she gets all kinds of threatening messages!What kind of ballerina would want to scare Jessi? The Baby-sitters don't know, but they're not going to let anyone get away with it for long.The best friends you'll ever have--with classic BSC covers and a letter from Ann M. Martin!

Someone is breaking into houses in Kristy and Abby's neighborhood. Meanwhile, Mallory is struggling to help a woman who has suddenly appeared in town with no identification and no memory. In New York City Stacey and Claudia are being followed. And someone is leaving very odd, unsettling gifts and Stacey's door.

While visiting Stoneybrook's new museum, Claudia is horrified to learn that someone has stolen some priceless coins and replaced them with forgeries.